[INFO] updating cached repository RustExamples/understand_ownership
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/RustExamples/understand_ownership
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/RustExamples/understand_ownership" "work/ex/beta-1.38-1/sources/1.37.0/gh/RustExamples/understand_ownership"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/RustExamples/understand_ownership'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/RustExamples/understand_ownership" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/RustExamples/understand_ownership"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/RustExamples/understand_ownership'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e129a09715d80aababea59e9878dec5062aa98b6
[INFO] sha for GitHub repo RustExamples/understand_ownership: e129a09715d80aababea59e9878dec5062aa98b6
[INFO] validating manifest of RustExamples/understand_ownership on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of RustExamples/understand_ownership on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing RustExamples/understand_ownership
[INFO] finished frobbing RustExamples/understand_ownership
[INFO] frobbed toml for RustExamples/understand_ownership written to work/ex/beta-1.38-1/sources/1.37.0/gh/RustExamples/understand_ownership/Cargo.toml
[INFO] started frobbing RustExamples/understand_ownership
[INFO] finished frobbing RustExamples/understand_ownership
[INFO] frobbed toml for RustExamples/understand_ownership written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/RustExamples/understand_ownership/Cargo.toml
[INFO] crate RustExamples/understand_ownership already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing RustExamples/understand_ownership against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/RustExamples/understand_ownership:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 9590d66218cf6cffeadf98852852b5ad3cd80c942a9f999fd5beeacb7bde91e1
[INFO] running `"docker" "start" "-a" "9590d66218cf6cffeadf98852852b5ad3cd80c942a9f999fd5beeacb7bde91e1"`
[INFO] [stderr]    Compiling understand_ownership v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `word`
[INFO] [stderr]  --> src/main.rs:5:9
[INFO] [stderr]   |
[INFO] [stderr] 5 |     let word = first_word(&s);
[INFO] [stderr]   |         ^^^^ help: consider prefixing with an underscore: `_word`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `word`
[INFO] [stderr]  --> src/main.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let word = first_word(&s[..5]);
[INFO] [stderr]   |         ^^^^ help: consider prefixing with an underscore: `_word`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `word`
[INFO] [stderr]  --> src/main.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let word = first_word(literal);
[INFO] [stderr]   |         ^^^^ help: consider prefixing with an underscore: `_word`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `word`
[INFO] [stderr]  --> src/main.rs:9:9
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let word = first_word(&literal[..5]);
[INFO] [stderr]   |         ^^^^ help: consider prefixing with an underscore: `_word`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.78s
[INFO] running `"docker" "inspect" "9590d66218cf6cffeadf98852852b5ad3cd80c942a9f999fd5beeacb7bde91e1"`
[INFO] running `"docker" "rm" "-f" "9590d66218cf6cffeadf98852852b5ad3cd80c942a9f999fd5beeacb7bde91e1"`
[INFO] [stdout] 9590d66218cf6cffeadf98852852b5ad3cd80c942a9f999fd5beeacb7bde91e1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/RustExamples/understand_ownership:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] cdaaf258cc6172eda07c17154558c9d7ddce11fc39caba0b829a88e4332c79fa
[INFO] running `"docker" "start" "-a" "cdaaf258cc6172eda07c17154558c9d7ddce11fc39caba0b829a88e4332c79fa"`
[INFO] [stderr]    Compiling understand_ownership v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `word`
[INFO] [stderr]  --> src/main.rs:5:9
[INFO] [stderr]   |
[INFO] [stderr] 5 |     let word = first_word(&s);
[INFO] [stderr]   |         ^^^^ help: consider prefixing with an underscore: `_word`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `word`
[INFO] [stderr]  --> src/main.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let word = first_word(&s[..5]);
[INFO] [stderr]   |         ^^^^ help: consider prefixing with an underscore: `_word`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `word`
[INFO] [stderr]  --> src/main.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let word = first_word(literal);
[INFO] [stderr]   |         ^^^^ help: consider prefixing with an underscore: `_word`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `word`
[INFO] [stderr]  --> src/main.rs:9:9
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let word = first_word(&literal[..5]);
[INFO] [stderr]   |         ^^^^ help: consider prefixing with an underscore: `_word`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.61s
[INFO] running `"docker" "inspect" "cdaaf258cc6172eda07c17154558c9d7ddce11fc39caba0b829a88e4332c79fa"`
[INFO] running `"docker" "rm" "-f" "cdaaf258cc6172eda07c17154558c9d7ddce11fc39caba0b829a88e4332c79fa"`
[INFO] [stdout] cdaaf258cc6172eda07c17154558c9d7ddce11fc39caba0b829a88e4332c79fa
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/RustExamples/understand_ownership:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] d030d0813e9bfef2987412feeedb39671f31629599f9196884281f762c7e9698
[INFO] running `"docker" "start" "-a" "d030d0813e9bfef2987412feeedb39671f31629599f9196884281f762c7e9698"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/understand_ownership-b3d3cbdf8bad321f
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "d030d0813e9bfef2987412feeedb39671f31629599f9196884281f762c7e9698"`
[INFO] running `"docker" "rm" "-f" "d030d0813e9bfef2987412feeedb39671f31629599f9196884281f762c7e9698"`
[INFO] [stdout] d030d0813e9bfef2987412feeedb39671f31629599f9196884281f762c7e9698